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I want to check if a variable exists. Now I'm doing something like this:

try:

   yourVar

except NameError:

   # Do something.

Are there other ways without exceptions?

1 Answer

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by (10.9k points)
edited by

@Selena, The method varies with the type of variable.

1. If you want to check the existence of a local variable use:

if 'yourVar' in locals():

  # yourVar exists.

2.if you want to check the existence of a global variable use:

if 'yourVar' in globals():

  # yourVar exists.

3.If you want to check if an object has an attribute:

if hasattr(obj, 'name_attr'):

  # obj.name_attr exists.

Hope this helps!

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